Preparation method and application of high-purity chloride molten salt

A chloride and molten salt technology, which is applied in the field of preparation of high-purity chloride molten salt, can solve the problems of complex, unsafe, and easy-to-corrosion preparation methods of high-purity chloride molten salt, and alleviate the impact of molten salt corrosion , low cost, reduce the effect of corrosion

Inactive Publication Date: 2019-01-15
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the current preparation method of high-purity chloride molten salt is complex and unsafe, and the structural materials are easy to corrode in molten salt, which restricts the large-scale industrial application of chloride molten salt, the present invention provides a high-purity chloride molten salt Preparation method and its application

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  • Preparation method and application of high-purity chloride molten salt
  • Preparation method and application of high-purity chloride molten salt
  • Preparation method and application of high-purity chloride molten salt

Examples

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Embodiment 1

[0028] 1.1 High-purity NaCl-KCl-CaCl 2 Preparation and Characterization of Molten Salt

[0029] According to the preparation method of a kind of high-purity chloride molten salt provided by the present invention, comprises the following steps:

[0030] 1) Crucible pretreatment: clean the graphite crucible with deionized water in an ultrasonic instrument for 10-15 minutes, and repeat the cleaning of the graphite crucible three times. The cleaned graphite crucible is placed in an oven and dried at >100°C to remove free water to obtain a dry graphite crucible. Take out the graphite crucible, put it into a high-temperature resistance furnace covered with an inert atmosphere, and calcinate at a high temperature of ≥700°C for ≥10 hours to remove the bound water therein. After being cooled to room temperature, it is stored in a glove box for subsequent use, and the water and oxygen contents in the glove box are respectively less than 5 ppm.

[0031] 2) Accurately weigh untreated c...

Embodiment 2

[0046] 2.1 High-purity NaCl-KCl-MgCl 2 Preparation and Characterization of Molten Salt

[0047] According to the preparation method of a kind of high-purity chloride molten salt provided by the present invention, comprises the following steps:

[0048] 1) Graphite crucible pretreatment: clean the graphite crucible with deionized water in an ultrasonic instrument for 10-15 minutes, and repeat the cleaning of the graphite crucible three times. The cleaned graphite crucible is placed in an oven and dried at >100°C to remove free water to obtain a dry graphite crucible. Take out the graphite crucible, put it into a high-temperature resistance furnace covered with an inert atmosphere, and calcinate at a high temperature of ≥700°C for ≥10 hours to remove the bound water therein. After being cooled to room temperature, it is stored in a glove box for subsequent use, and the water and oxygen contents in the glove box are respectively less than 5 ppm.

[0049] 2) Accurately weigh th...

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Abstract

The invention relates to a preparation method of a high-purity chloride molten salt. The method is: providing an untreated chloride molten salt having a purity of 95% or more; heating the untreated chloride molten salt to a liquid state to obtain a molten chloride molten salt; adding an active metal into the molten chloride molten salt, standing to allow the active metal and water and oxidizing impurities in the untreated chloride molten salt to respectively perform redox reaction to generate precipitates, wherein the active metal comprise at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc and iron; the oxidizing impurities comprise OH<->, SO4 < 2->, SO4 < 2->, NO3 < 3-> and NO2 < 2->; filtering and removing residual solid-state active metals and precipitates inthe molten chloride molten salt so as to obtain the high-purity chloride molten salt, wherein the high-purity chloride molten salt contains the dissolved active metals. The invention also relates toapplication of the high-purity chloride molten salt. The preparation method of the high-purity chloride molten salt provided by the invention is simple, is safe and solves the problem that a structural material is easy to corrode in the molten salt and restricts the industrial large-scale application of the chloride molten salt.

Description

technical field [0001] The invention belongs to the field of molten salts, and in particular relates to a preparation method and application of high-purity chloride molten salts. Background technique [0002] Molten chloride salts are composed of metal cations and anions (Cl - ) is a compound that is molten at high temperature. Chloride molten salt has a wide working temperature, low viscosity, good electrical conductivity, high ion migration and diffusion rate, high specific heat capacity, and also has the ability to dissolve metals, nuclear fuels and other materials, so it is used in molten salt electrolysis, molten salt refining, It has a wide range of applications in molten salt electroplating, fuel cells, batteries, solar thermal, molten salt reactors and energy storage. Chloride molten salt has many types and is cheap, and it is a kind of very potential high-temperature heat transfer and heat storage medium. However, chloride molten salt is very easy to absorb water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/12
CPCC09K5/12
Inventor 唐忠锋阴慧琴王建强苏兴治凌长见刘伟华汪洋姚思德
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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